436 The Ohio Naturalist. [Vol. XV, No. 3, 



DEMONSTRATIONS. 



A Nematode Parasite of Cryptobranchus F. H. Krecker 



Cross Sections Illustrating Rate of Tree Growth 



William R. Lazenby 

 Varieties of Domestic Guinea Pigs. (Room 55.) . . W. M. Barrows 



Tailless Cat W. M. Barrows 



Orthoptera Not Hitherto Recorded from Ohio W. J. Kostir 



A Scale of Ohio Forest Types to Indicate the Fertility of Soil for 



Agricultural Crops Forest B. H.Brown 



Photographs of Leaf Hoppers and Frog Hoppers . . Herbert Osborn 



Edward L. Rice, Secretary. 

 Delaware, Ohio, December 5, 1914. 



MEETING OF THE BIOLOGICAL CLUB. 



Orton Hall, April 20, 1914. 



This meeting was held in conjunction with the Natural History 

 Society and was called to order by the President of the Natural 

 History Society, Mr. Meckstroth. The reading of the minutes 

 was omitted. 



Prof. Dachnowski had the first paper of the evening on "Cer- 

 tain Problems of Plant Growth. " In his experiments he found that 

 the absorption of glycocoll is not connected with the transpi ra- 

 tional water loss but with the efficiency of the nutritive metabolism 

 and with the amount of water retained within the plant and 

 involved in metabolism. The retention of water and not the 

 transpirational water loss is the physiological function, correlated 

 with, and indispensable to growth in general. 



Mr. Reese had a paper on Introduced Insects in which he 

 discussed the various introduced pests that bother American 

 horticulturists and vegetable gardners. 



The meeting then adjourned. 



Blanche McAvoy, Secy. 



Date of Publication, January 14, 1915. 



