THE STRUCTURE OF TRYPANOSOMA LEWISI. 789 
termination of the body, these two measurements are a little 
uncertain and subject to considerable variation. The inter- 
nuclear region is measured from the karyosome to the centre 
of the kinetonucleus; the post-nuclear length is from the 
kinetonucleus to the posterior extremity of the body. The 
undulating membrane is measured by following up the 
sinuosities of the marginal flagellum from the kinetonucleus 
to the anterior extremity of the body. 
y- 
Body Flagellum. | 
Total length i san i : | 
} ” | 
Geootinna) Pre- Inter- Post- Greatest | Undulat- | Fr 
=) fe nuclear nuclear nuclear Tanaka. | ing mem- I Glace in 2 
region. region. region, "|. brane. | BS es 
(Fig. 1) 28 = = = 5 21 ray ay 
(Fig. 2) 32 — = = 2 24 | 8 
(Fig.3) 305) 6 12 45 2 Of, as 
(Fig. 4) 28°6 6 il 4 16 27-6.-|| 4:6 
(Fig. 5) 28 8 i a: 33 16 214 | 56 | 
(Fig. 6) 31 7 125 5 16 MN ay 
(Fig. 7) 33 63 15 a3 Pao |) pes | 8:3 
(Fig. 8) 32 9 12:5 5 15.6)\|" 3) 2463 page 
32:3 8 12°5 5 15 24 7 
30°3 6 iB 4. 1G Che 2s | Z 
| | 
* = — | — —— —> 
| Average 30°57 704 | 12°22 Ac5 1:64. 23°51| 6°88 
Salvin-Moore, Breil, and Hindle have recently (1908) 
published an elaborate study of Trypanosoma lewisi. 
Since they deal chiefly with the multiplicative period, when 
the trypanosomes vary enormously in size and form, it is 
difficult to compare their results with mine. Their fig. 1 
appears to represent a so-called “adult” trypanosome, in the 
period when multiplication is past, comparable to the forms 
with which I am dealing in this memoir. If that isso, I think 
auyone who has the most elementary acquaintance with T. 
lewisi will agree with me that their technique has distorted 
and deformed the creature very greatly. ‘his is not sur- 
prising to me, since these authors rely on Flemming’s fluid as 
