IOWA ACADEMY OF SCIENCES. 



1J5 



In preserviug the delicate larval forms alive in aquaria, for stud}' we 

 found ditriculty, and only succeeded by using large glass dishes (scrupu- 

 lously clean) They were kept from direct sunlight and the water was 

 changed or fresh quantities added every three or six hours, as the case 

 might require. 



Several methods were adopted for fixing and preserving the material, 

 according to the character of the specimens in hand. 



Medusai were successfully prepared by — 



1. Placing into solution, until they sink to bottom: 



j 10% CuSO, — 100 c. c. 

 I Sat. sol. Hg Cl.^ — 10 c. c. 



2. Into 5% KjCroO^— 1-7 days. 



3. Wash thoi'oughly in water. 



4. Graded alcohols, 35-90. 



Larger Jelly-fish and Ctenophopes were preserved for histological pur- 

 poses by using — 



1. Erlicki's fluid, G-10 days. 



2. Wash in water slightly acid. 



3. Graded Alcohols, 33-90. 

 Crustacean larva were treated. 



1. Sat. aq. sol. Hg CI,— 5 minutes. 



3. Wash with 33% alcohol and transfer through graded alcohols to 90% . 



Other methods were tried but best results were obtained by using those 

 above described. 



Surface collections from tropical waters are intensely interesting to the 

 student of animal life. There in the surface water of the sea he finds the 

 great nursery of marine forms, both plant and animal. Further, we are 

 informed, sufticient reason warrants the statement that, likewise, all living 

 forms had origin in minute, fi'ee-swimuiing organisms upon the bosom of 

 the ocean in past ages. A candid study of the life histories of typical 

 animals— in which they pass from a simple cell through various meta- 

 morphic stages to the adult forms— confirms the doubtful in the doctrine of 

 evolution. And a true conception of relationships existing between mem- 

 bers of so called families reveals the truth of the oft repeated statement, 

 that "the ocean is the original haven of all life." The more we become 

 conversant with marine life the more definitely are we impressed with the 

 fact that it is from that source we must ask further information, that shall 

 throw light upon many Biological problems at present unsolved. 



THE VASCULAR SUPPLY OF THE TEETH OF THE DOMESTIC CAT. 



C. C. NUTTING, IOWA CITY. 



After all that has been written about the anatomy of the domestic cat it 

 would seem a hopeless task to find any facts of real importance in a field so 

 carefully gleaned by Wilder and Gage and a host of othtr writers of the past 

 and present. 



