REGENERATION OF ANTENN#Z—SCHMIT-JENSEN. 5385 
disturbing factors as occurred in my material (the different ages of the 
larve, the primitive method of amputation, etc.). 
Since the termination of these experiments with regeneration, I have 
made numerous different amputations, by the aid of very fine scissors 
and a dissecting microscope, on larve of Carausius, which had been 
anesthetized with ether. Among the several places which I selected 
for amputation in these series of experiments may be mentioned the 
place where the antenna is inserted on the head, the middle of the 
basal joints, the end of the second and the third joint and others. 
These amputations can be easily made with considerable precision. 
I was unfortunately forced to abandon these series of experiments, 
as well as other preliminary, similar experiments with two other 
Phasmids, Bacillus Rossiz Fabr. and Diapheromera femorata Say, be- 
fore the regeneration had taken place. 
More thorough experimental work on this problem on a large scale 
is badly needed, but interesting aid to the understanding of these 
phenomena would surely result from historical study also. In this 
connection must be mentioned the gratifying accord between the 
experiment and the anatomical study in a similar field by C. Herbst, 
which has been referred to in the foregoing. 
Leaving herewith my experimental results to be further worked out 
by others, I shall in conclusion briefly mention such references in the 
literature on the Phasmide, as are of interest in this connection. 
There are not many, as apparently little work has been done with 
antenna-regeneration in this group of insects, in which the study of 
regeneration at one time caused particular interest. 
R. dé Sinéty (17) has amputated the antenna in Leptynia attenuata 
with the result, that regenerations were produced with 2 to 4 joints. 
In one case, where one antenna was completely removed, a small four- 
jointed antenna was regenerated, in which the basal joint was only 
half as long as in a normal antenna. 
R. Godelmann(18) amputated the antennz in Basillus Rossii Fabr. 
Of the results he only mentions that the regenerations had a slow 
growth and never reached even approximately normal size. 
Otto Meissner(19) who has done considerable work with the biology 
of Dizippus morosus Br., briefly mentions that regenerated antenn 
often are shorter than the normal, but that they may contain never- 
theless the normal number of joints. 
It is apparent that none of these authors has observed homeotic 
regeneration.’ | 
received valuable help in this work and who, for example, placed the library of the histological- 
embryological laboratory in the Copenhagen University at my disposal. 
