Proceedings of the American Philosophical Society Held at Philadelphia for Promoting Useful Knowledge, Томи 41 – 42The Society, 1902 |
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Сторінка 4
... objects designated be altered . And by using correct names a great advantage is secured to collectors and to lit- erature . In my studies of the North American Noctuids for the past forty years , I have had occasion to investigate 4 ...
... objects designated be altered . And by using correct names a great advantage is secured to collectors and to lit- erature . In my studies of the North American Noctuids for the past forty years , I have had occasion to investigate 4 ...
Сторінка 41
... objects of great interest to the general morphologist . At different times and by different investigators they have been variously regarded as allied to Mollusca , Polyzoa , Annelida , Chaetognatha and Phoronis , while others have ...
... objects of great interest to the general morphologist . At different times and by different investigators they have been variously regarded as allied to Mollusca , Polyzoa , Annelida , Chaetognatha and Phoronis , while others have ...
Сторінка 105
... object which he studied , the theories of Moore , Brauer and Häcker concerning the relation of the synapsis to the last ovogonic division and to the processes of reduction and maturation . " Von ' Reduktion , ' " he says , " ist nicht ...
... object which he studied , the theories of Moore , Brauer and Häcker concerning the relation of the synapsis to the last ovogonic division and to the processes of reduction and maturation . " Von ' Reduktion , ' " he says , " ist nicht ...
Сторінка 106
... object of ascertaining whether reduction took place in parthenogenetically developing eggs . The number of chromosomes in the germinal vesicle is eighty- four , and their structure is quadripartite , i . e . , each consists of four ...
... object of ascertaining whether reduction took place in parthenogenetically developing eggs . The number of chromosomes in the germinal vesicle is eighty- four , and their structure is quadripartite , i . e . , each consists of four ...
Сторінка 107
... object do not , however , conclusively prove this to be the case , since the tetrads are cubical in shape , the length no greater than the width . Indeed Häcker himself says of this 1902. ] NICHOLS - SPERMATOGENESIS ONISCUS ASELLUS LINN ...
... object do not , however , conclusively prove this to be the case , since the tetrads are cubical in shape , the length no greater than the width . Indeed Häcker himself says of this 1902. ] NICHOLS - SPERMATOGENESIS ONISCUS ASELLUS LINN ...
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Africa AMER AMERICAN PHILOSOPHICAL SOCIETY animals appear April Asia Australia auta autic beds belong blastopore body brachiopods Cambaroides Cambarus canals cells Central chromosomes cœlom connection contains crude oil Crustacea crystals curves Decapods deposits distillates distribution division domeykite drones eggs enteron Eocene equation evidence existence fact fauna Feb'y fertilization follicle formation forms fossils freshwater genera genus geographer geological Greater Antilles hydrocarbons islands Jan'y Jurassic land larva larvæ later Lower Cretaceous male mantle mass Mesozoic method Mexico Miocene nature Noctua North northern nuclei observed Ocean Oligocene origin parthenogenesis Pennsylvania petroleum Philadelphia PHILOS plate Pliocene polar body posterior Potamobius present probably PROC produced Prof queen region relation represented river sandstones separated shown solution South America southern species spermatocyte spermatogonia spermatozoa stage Terebratulina Tertiary theory tion Upper Cretaceous Zool