" GROUSE DISEASE "—STRONGYLOSIS 



227 



Some young plants of bell heather were sought, and eventually two or three small 

 suitable plants were detached uninjured from crevices in rocks. These were 

 planted in a Petri dish, and the dish was half filled with water so as to 

 cover the roots. The plants were then set aside. A week later they were 

 found to have survived the transplantation, and to have commenced to grow 



Fig. 28. 



Fig. 29. 



Larvte forms of T. pergracilis 



Fig. 30. 

 Encysted larvse of T. pergracilis. 



under the new conditions. As the weather was showery the plants and 

 dishes were left out in the open, and for two or three days in succession 

 the raindrops hanging from the tips of the heather were microscopically 

 examined. They were found to be almost free of life. On one occasion, 

 however, a small free living nematode was found. Although slightly 

 resembling the larvae of Trichostrongylus pergracilis it was readily dis- 

 tinguished from them by its microscopical characters. 



