18 HooKER: PHYSIOLOGICAL OBSERVATIONS 
the amount of bending decreased, the gland was moved through 
successively smaller angles and the zone of bending was restricted — 
to shorter and more basal portions of the tentacle. 
TABLE VII 
ength etativel mete Length | | 
No. of Original ee Amt, of os eed | Amt. of | Relative a. | Amt, of Relative — 
Segment | Length] Reac. | Growth per Mm,] Reac- Growth} Amt. | Reac. | Growth| Amt. 
tion ion | tion | 
| 
I 23 23 ° te) 23 o oO 23 oo fe 
| 
2 40 40 o o 40 o 0 40 hd a 
3 it Ir ie) oO II te) oO ee [e) 1°) 
4 22 23 x 5 23 | re) fa) 23 Lae 0) 
5 35 34 3 9 sp 8 8 41 oe 
6 20 23 3 15 25 | 2 8 27 2. ae 
q 21 34 13 62 41 | 7 2I 59 18 | 44 
| | 
Total 172 || 192 20 17 204 12 | 6 gaa |". 20° | oe 
TasBLeE VII shows the growth of another tentacle during 
three successive reactions. The respective elongations were 0.2 
mm., 0.12 mm. and 0.2 mm. During the first reaction Segments — 
4 to 7 grew. The rate of growth was most intense in the lowest 
segment and decreased toward the apex. The second reaction 
was produced by growth in Segments 5 to 7. Segment 4 did not 
elongate. Here again the most intense growth was at the base. 
In the third reaction growth was confined to Segments 6 and 7; 
and was considerably more intense in the latter. Segments 4 
Nhe ee he 
Ee Ne Se ee tig Sp eT ieee eee Po ROE, 
and 5 did not increase in length. The tentacle was again stimu- — 
lated but did not bend. 
TABLE VIII 
| a | | oe 
gth Length | Length 
ay After Relative After Af 
No. of lease First | Amt. of Amt. of | Relative ter | amt. of |Relative 
Segment | Length Rens Growth Ler Bas oe Growth| Amt, Ss Groat Amt. 
tion tion tion 
| 
I 85 85 te] ° 85 oO ° 85 ° o 
2 52 54 2 4 54 o (3) 54 o o 
3 82 88 6 Yi 89 I I 89 is) o 
4 23 25 2 9 33 8 32 38 5 15 
5 36 42 6 17 51 9 21 60 9 18 
Total ...| 278 204 16 6 ata 1 8 6 326 14 £5 
A third example of this sort is given in TaBLE VIII. The > 
reaction time of the first inflexion was 1 minute, 40 seconds. — 
Segments 2 to 5 increased in length. The rate of growth was | 
