220 
Development of Ascaris 
The larvae are 0-22 mm. and 0-28 mm. in length, oesophagus length 
0-084 mm. and 0-11 mm., the proportion of length of oesophagus/total 
length 1/2-6 and 1/2-5. 
Text-fig. 3 is from a larva in the lung of the rat five days after 
the first infection and two days after the last infection. The larva 
measures 0-5 mm. in length, head to nerve ring 0-067 mm., length of 
oesophagus 0-135 mm., length of oesophagus/total length 1/3-7. 
Fig. 3. Larva from the lung of rat G, in weak corrosive sublimate solution, x 340. 
Fig. 4. Larva from the lung of rat C, in weak corrosive sublimate solution, x 102. 
The specimens from which Text-figures 3, 4 and 5 are drawn were 
killed and mounted in weak corrosive subhmate solution. 
Text-fig. 4 gives the outhne of a larva from the lung of the rat six 
days after the first and two days after the last infection. Total length 
0-84 mm., length of oesophagus 0-17 mm., length of oesophagus/total 
length 1/4-9. 
