lot 



bi'j-os were about forty-eight hours of incubation, there being eleven well- 

 defined somites in one and sixteen in the other. The neural canal was 

 partiallj^ closed, but only one brain vesicle in each case was developed. 

 Between the two anterior ends was a mass of much distorted structures 

 and apparently including several gill arches. 



The eggs were secured from reliable parties, and I have every reason 

 to consider them fresh and that they had been properly cared for. My as- 

 sistant assures me that the temperature of the incubator was regular and 

 that all conditions were normal. 



The slide from wliicli 1h(^ drawing was made was prepared by Mr. 

 Charles Sudrauskl. 



TiiK Lake Lap.uratory at Sandusky, Ohio. 

 Mel T. Cook. 



The past few years has witnessed a wonderful increase in facilities 

 for l)iologieal work. Among the most noticeable features has ))eon the 

 estal)lislim('nt of summer laboratories especially adapted for biological 

 research until avo now have six marine and a larger number of inland 

 lal)Oi-atories. Since tlie cliaraeter of liiological work is so dependent upon 

 tlio locality, and since eaeli locality presents certain prol)lems peculiar to 

 itself, each of these laboratories has certain advantages over its friendly 

 rivals and the itinerant biologist has the opportunity of reaping the lieue- 

 fits from all. He meets his fellow-worker and studies the varied fauna 

 and flora under the most favorable conditions. 



Among the earliest of these laboratories was the Lake Laboratory at 



Sandusky, Ohio, which was first opened in 1895, under the direction of 



Professor Kellicott, of the Ohio State University. In 1S9S Professor 



Kellicott died and the laboratory came under the direction of his succe-^sor. 



Prof. Herbert Osborn, the present director. 



The laboratory was at first intended for investigation only, and for 

 the first four seasons was used by only three or four workers. In 1899 

 there were fourteen investigators and it was then decided to offer regular 

 courses; this was done in 1900 and each succeeding j^ear. For the past 

 three seasons the Increase in interest has lieen very pronounced. In 1902 

 there Avere twenty-four students and six instructors; of the twenty-four 



