.VAR/XE BIOLOGICAL SlAriOXS ()/■' IJKOI'i:. 22X 



III. — Holland. 



Holland, in the summer of i S90. opened its zoological 

 station in the Helder, a locality which, for this purpose, had 

 long been looked upon with the greatest favor. There is here 

 an old town at the mouth of the Zuyder Zee, the naval strong- 

 hold of Holland, a station favorable for biological work on 

 account of the rapid-running current renewing the waters of 





ffV-^'" " iiidii'ift 



Dutch Zoological Station at thk. llF.i.nER. 

 (Fig. from Tijdschr. d. Ned. Dierk. Veieen. 5 Juli, 1890.) 



the Zee. The station was founded by the support of the 

 Zoological Society of the Netherlands, whose valuable work 

 by the contributions of Hubrecht, Hoek, and Horst, has long 

 been known in connection with the development of the oyster 

 industry of Holland. The work of the Society had formerly 

 been carried on by means of a portable zoological station 



