36 M. L. Shorey 
right wing, but aside from this defect the embryo was normal 
externally. 
Sectioning showed that the scapula was entirely lacking, the 
clavicle nearly normal, and the coracoid and head of the humerus 
present but somewhat defective. On the uninjured side the same 
muscles were to be distinguished as in the last experiment, but on 
the operated side only the merest remnants are present, and these 
are so abnormal in shape and position, as well as in size, that it 
is difficult to identify them. Probably they are the pectoralis 
major, trapezius, latissimus dorsi, triceps, subclavius and deltoides. 
Fig. 41s a photograph of a cross-section through the injured region. 
The loss in the peripheral nervous system may be seen by com- 
paring A and Cof Fig. 33. The abnormality is much greater than 
in the last experiment, but this is to be expected because of the 
changed positions of the muscles as well as the increased loss 
in size. | 
Again it will be seen that wherever a muscle has been destroyed 
the nerve is also absent. 
Measurements in this specimen show the following losses: 
WIDTH THICKNESS 
NERVE TRUNKS PER CENT PER CENT 
AGH Syerencnreyene arose atesare ayereeyeieyole cteie takai oitie nc eenatevene elovsnet eves lors Perera taecere 1ay5 34.2 66.2 
NG Tesh Rodan rea a BD OAnIG Ge Aaoen bdo Spat Goo uiooun moder UaGD Agr 21.4 20 
NOPE os cvs grains ‘aig ahs Seg SLM SLA ee ore Ameer ean tie See Bis 30 12T 
VENTRAL ROOTS WIDTH THICKNESS 
LLB a ena BEAR enim cod Hn Dotan OOO nad tbo GaMOSHNAOnS CoaGEe ions (2) 333 
WAR a omSee ae alt nonedaaa argo bills Jomaa dda S64 o Re pean perience 24 ° 
KOCH 72 sce keyekieic sven Masse aie Aes opefeis aietel event eheetegs tal wiss ofetis) oters ahs) 2\ a's ie 20 II. 
LATERAL DORSO-VENTRAL 
DIAMETER DIAMETER THICKNESS 
GANGLIA PER CENT PER CENT PER CENT 
iPad Bacaree eaeanic ah aod on comnts Mitra de anoto meat ores so Eee) 16.7 12.4 
A ian aOR SCO ACP RADGoe Socom Ao nls tice” 0s} 28.9 ING 
T4thiic is. fe het tontves See Le eae eerS ot) LOL] 14.9 35 
The cells of the ventral horn were counted as before, showing 
losses as follows: 
PER CENT 
MACHOL. E's eisic crs oo oy ors k Syelensraree eae ake UPON RE che iene sic Seis nye ead teers Tse 
Hiab a(s nib eo aA Sonn eAC Caco Gras Second OU On OMAR ENUAt as ooo SAMIR ecme cee 49-7 
MOGHINELVE tists eats asa Pcie ese cere hse oie Saket SO Riahaye ota Seta e GeO eel see ee her oraratels 71.8 
