2496 



Journal of Applied Microscopy 



of the pollen of the lily in this liquid and there will be no difficulty in getting 

 good long tubes for study. 



I have not yet tried it, but it would be an interesting experiment to see if the 

 pollen of other plants would grow in the stigmatic liquid of the lily. Results of 

 this kind might be instructive when compared with experiments in hybridization 

 and on the prepotency of pollen. W. C. Coker. 



University of North Carolina. 



Greenhouse for Pathological Investigation Under Control 



Conditions. 



The Department of Botany and Vegetable Pathology of the Maryland Agri- 

 cultural College has designed the greenhouse illustrated below, to meet the needs 

 existing for the study, under control conditions, of injurious fungi or other plant 

 growth. The greenhouse here illustrated from the constructor's plan is designed 



Fig. 1." — End view. 



to give two main conditions, a warm and a cool room, and seven secondary con- 

 ditions, each of which may be varied either five or ten degrees from the next 

 lower compartment by the opening of valves controlling additional heat cells. 

 The specifications call for sufficient valves, etc., to give the above control to each 



Fig. 2. — Elevation. 



compartment and also to cut off either of the main sections of the house, any or 

 all of them independently of the rest. The design was to obtain controlled con- 

 ditions with temperatures, and humidity also, of different degrees, so that any 

 question that might arise could be studied under the optimum as well as maxi- 



