njoij] Trachael Supply, Nervous System Corydalis 49 



Second, two large branches which come from large lateral 

 tracheae and run up to the lateral and ventral caudal edges of the 

 ganglion. 



The first, or more cephalic of these pairs of tracheae give off 

 branches to the upper part of the ganglion. Upon entering, each 

 divides at once into about two main parts and these short branch- 

 es divide again into several and branches from these supply by 

 both superficial and deep portions, the upper half of the ganglion, 

 with a tracheole for each connective with the brain and small 

 tracheoles to each of the nerves which come oft" in this retrion. 

 The branches which go to the nerves and the connectives break 

 up into a very fine network of tracheoles without anastomosis. 

 In the case of the connectives, the area supplied is less than one 

 half the length of the distance to the brain. The fine tracheoles 

 in the connectives and the larger nerves run in a sort of circular 

 or spiral manner. Many minute tracheoles are given off from all 

 the branches in the ganglion. 



The second or caudal pair of tracheae are larger than those 

 just described. They come from long lateral branches from below\ 

 They supply the lower half of the ganglion, including the con- 

 nectives, with tracheae and tracheoles. On entering the ganglion 

 they each divide at once into about two main parts; the more 

 cephalic portion of a number of branches which run towards the 

 cephalic part of the ganglion. The other smaller portion consist- 

 ing chiefly of a large branch which supplies the most caudal part 

 of the ganglion with small tracheae and a large branch which sup- 

 plies the connective of its own side by one very long twig and 

 others shorter. 



Superficial and deep branches form a dense network through- 

 out the ganglion. There seem to be about as many small trach- 

 eoles in the middle line as at the periphery. Branches from one 

 side cross to the opposite side in considerable numbers. 

 Branches from the upper and lower supplying trachae interlace 

 considerably. There are many long fine tubules with few side 

 branches, few free ends, and no anastomoses. Although the trach- 

 eoles are abundant in all parts of the ganglion, the densest mass 

 of them is in the central part, on each side. 



The longest connective branches from the lower tracheae run 

 only about one third of the length of the connectives between this 

 ganglion and the first thoracic. The connectives between these 

 two ganglia are very long and their middle portion is supplied on 



