TABLE OF CONTEXTS 



TNTT^ODTTTIOX "4 



TAIUJO OF (;()NTENTS 5 



PART I 



THE LOWER LIMIT OF VITAL TEMPERATURES 



DEFINITIONS AND PKFLIMINARY REMARKS 



I. INFRACELLULARS 13 



1. Vitamins and Hormones 1:1 



2. Enzymes H 



0. ICiizyiiKtids 16 



4. Mrnses 17 



n. MONOCELLULARS 19 



Skciiox I. Protophyta 19 



1. liacteria and Bacterioids 19 



2. Yeasts 25 



3. Monocellnlar Alf>ae 27 



Section II. Puotozoa 29 



L Rhizopods 29 



2. Ciliates 30 



3. Flagellates 31 



III. OEILM CELLS, SPOKES AND SEEDS 32 



1. Spermatozoa 32 



2. Eggs 31 



3. Spores 37 



1. Seeds 40 



IV. ISOLATED CELLS AND TISSIES.. 43 



Skctiox I. I*LAXT ^Iateuial 43 



1. Hair Cells 43 



2. Epidermal Tissne 44 



.'>. Tnberons Tissne 47 



4. Tissne from Leaves, Stems, Roots, etc 49 



Skctiox II. Aximal Material 54 



1. Blood 54 



2. Embryonic Tissne 55 



3. Ciliated lOpithelinm 50 



4. Mnscnlar Tissne 57 



5. Nerve Tissue 59 



V. METAPHYTA 01 



L Fungi (51 



2. Algae 00 



5 



