Roijal Society. 281 



existence of parts especially adapted to perform tliis function, and 

 which, in those experiments that had failed to exhibit the phaeno- 

 raenon, had been themselves removed. But the author found that 

 in every instance of the mutilations thus practised, the perfect in- 

 sect possessed a coxa, or basilar part of the limb ; and this was the 

 case even in those in which a new organ was not reproduced. From 

 this fact, taken in conjunction with the formation of new entire limbs 

 in the lulidae after the removal of every portion of the previous 

 ones, the author infers that the power of reproduction resides in the 

 whole of the organized tissues. 



The author found that each newly produced limb is, in every 

 case, composed of all its essential parts, namely coxa, femur, tibia, 

 tarsus and claw ; but its development is scarcely ever entirely nor- 

 mal, being either deficient in some of the tarsal joints, or irregular 

 in the development of its armature. 



The following are the general conclusions which the author de- 

 duces from his investigations. Slight wounds in the larvae of insects 

 always heal, except when the viscera have protruded, or excessive 

 hemorrhage has occurred : severe wounds, such as those attending 

 the excision of a limb, also frequently heal. It is when the wound 

 is in the line of action of the principal muscles of the body that pro- 

 trusion of the viscera takes place. For the healing of wounds, the 

 first requisite is the arrest of the hemorrhage ; and this is effected, 

 as in the higher animals, by the coagulation of the blood, and the 

 formation of a clot ; and then a complete union of the separated 

 parts takes place beneath the eschar formed by the clot. After this 

 union, the reparation of the injury is commenced by a development, 

 from the injured surface, of parts corresponding to those that had 

 been removed. For the production of a new limb, one change of 

 skin, at least, is necessary. The healing of the wound after the 

 removal of a part, and the subsequent reproduction, although they 

 do not prevent, yet certainly retard the natural changes. Lastly, 

 the author has established the fact, that reproduction of lost parts 

 takes place in metabolic as well as in the ametabolic articulata. 



Feb. 6th and 13th, 1845. — "On the Structure and Development 

 of the Blood. — First Series. The development of the Blood-Cor- 

 puscle in Insects and other Invertebrata, and its comparison with 

 that of Man and the Vertebrata." By George Newport, Esq., F.R.C.S., 

 President of the Entomological Society, &c. Communicated by P. 

 M. Roget, M.D., Sec. R.S. 



The author commences his paper by remarking, that he was led 

 to the present inquiry by some curious facts relating to the blood of 

 insects, which attracted his notice while engaged on the last paper 

 he presented to the Royal Society, on the reproduction of lost parts 

 in insects and Myriapoda. Some of these facts he is desirous of 

 making known at once to the Society, preparatory to his offering 

 them more extended researches on the blood of the Invertebrata, and 

 its comparison with that of the higher animals. 



The chief purpose of the author in the present paper, is to show 

 the analogy which exists between the different corpuscles in the 



Ann. ^ Mag. N. Hist. Vol.xv. X 



