Miscellaneous, 373 



foiind out iiad been observed by Prevost and Lebert. If the tails of 

 young tritons are observed, capillaries are readily met with, which 

 terminate suddenly and bluntly like a bag. The termination of the 

 vessel is completely closed, and no trace of a continuation can be de- 

 tected. At this spot in several, a very thin long projection may be 

 observed, which imperceptibly disappears, and in others, as if two 

 such projections had united into a common arch ; it may likewise be 

 seen how this arch gradually inci'eases in diameter. This arch is 

 undoubtedly a new loop of capillaries. It is at first much too narrow 

 to allow of the passage of blood-corpuscles. A fine granular matter 

 appears moreover to close it, and even to prevent the passage of the 

 liquor sanguinis. The double contour of a separate wall may very 

 soon be perceived in it, especially at the point of its origin, but we 

 never perceive any cells or their nuclei. The nuclei, so distinctly seen 

 in the perfectly developed capillaries, which sometimes project inside, 

 sometimes outside, must consequently belong to a later period ; they 

 cannot be the nuclei of cells from which the capillaries had formed 

 by fusion. 



Although I have convinced myself of this, I am at the same time in 

 doubt, whether the nuclei which occur in the muscular fasciculi and 

 the bundles of cellular tissue, from which, according to Henle, the so- 

 called nucleolal fibres are developed, have not belonged to previously 

 existing cells, and whether these nuclei do not owe their origin 

 jTather to a subsequent new production. This subject therefore de- 

 'serves further observation. — From M'dllers Archiv, 1844, Part 5. — 

 J. W. G. 



REPRODUCTION OF LOST PARTS IN THE ARTICULATA. 



Amongst the subjects of physiological interest exhibited at our 

 nieetings, I may notice an instance of Gynandromorphism in Arctia 

 Caja, by Mr. Evans ; specimens of Cossonus, found in abundance in a 

 recently opened barrow in Lancashire, by the Rev. W. Sibson ; the 

 parasitism of Ccelyoocys conica on Saropoda furcatay by myself; and 

 the abnormal development and deficiency of joints in both antennae 

 of Otiorhynchus picipes, by Mr. Walton. But that which has ap- 

 peared to me to be of the greatest interest is a subject that has 

 often been before this Society, — the reproduction of lost parts in the 

 Articulata. At a meeting of this Society in March last, Mr. West- 

 wood exhibited a specimen of Croesus septentrionalis " which had one 

 of the hind legs much smaller than the other, and which he regarded 

 as an instance of arrested development" in accordance with some very 

 decided opinions formerly expressed by him. He also exhibited a 

 large apterous Phasma, which had one of the hind legs smaller than 

 the other ; and this he regarded as an instance of reproduction. Both 

 these examples were precisely analogous to the instance of reproduc - 

 tion in Phasma described in Mr. Fortnum's letter, and mentioned in 

 my Address last year. On exhibiting these specimens Mr. West- 

 wood expressed an opinion that the reproduction of lost parts can 

 ta,ke place only in those insects which undergo an incom])lete meta- 



