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 transpira- 
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. 
