AUTHOR’S AESTRACT OF TH!IS PAPER ISSUED 
BY THE BIBLIOGRAPHIC SERVICE, JULY 21 
THE SEASONAL CYCLE IN THE SPERMARY OF THE 
PERCH? 
CLARENCE L. TURNER 
Zoological Laboratories of the University of Wisconsin 
CONTENTS 
Tealimtro cliuGhlOnvs,.Sts3 ta eaete ree bates sc unpeek | Pees AN ENA ROR ROE ie Rlear i Pa. neta: eee OSIL 
if Misterialbandemethodse PEE) OO ERAGE MPT ees 15S) 
Ill. Anatomy SPnCMeehe eet ea MOPAR oi hemo? A ewe OSL 
7 Generalltrelationship suena 455) oe Meee a ee ee Se OA 
RE AVOUMELEUC Vera Dil OMmngs hace gece aus ee ii one eae omens OGL 
3. Microscopical amenity ge AG eee ae ee OOO 
4. Discussion of seasonal Micolenical hs ar ges aad comparison with 
OuWerzanimMall oro UD Sateen serena ace see len ec ae OOO 
Wes Seasonalehistonysot cenncelllsimss erate tie stot ie teeter ts eee OOD 
[PBRestimeustacerandapenlodaolennlo Tat One merrier eee ere OO 
2. Period of proliferation and Broth st ton ae a eee 695 
33, IMSIOMTAAE AKIN Wine) SOCAN HOPAONMUE, AR. Jodeb beep dos gdesouse ooo OOM 
ES Spermatogonia........ : Exot SRS Ne TC A Tae mee OOS 
5. Synopsis and the mene ion Aineua. BOs Raa eee ta pana ee SOOO 
(6 ee Myer es hl Ce ee ea mete RETR GG 
Us Sie Mane. oe Bee ane e701) 
VY. Discussion of posnible Paeiora) mnienen ing tines germ- eel cules inne Dated Neh 700 
AVES ikl aaa aWZe seme Sete coe Me eet oR cele nee nee aE NEE inet AMER A MRE edleait cet) arama eens iTS) 
WARS illo ora. jo his 2 he-eeae rem sna ay eed eae ache cise Salis Cacetne AES eae comteera ey GOA 
I. INTRODUCTION 
The study of the germ cells in vertebrates has been confined 
principally to two lines of investigation. The first has under- 
taken to recognize the germ cells in the embryo and to follow 
their lineage, on the one hand, backward through the younger 
embryos to the first stages in which they may be positively 
identified as germ cells and, on the other, to trace them to the 
1A Thesis submitted to the Graduate School of the University of Wisconsin 
in partial fulfillment of the requirements for the degree of Doctor of Philosophy. 
2 A part of this work was carried out in the laboratories of the Department of 
Anatomy and Biology, Marquette University School of Medicine. 
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