Fig. 38. VIEW OF A THIN DISC OF HUMAN BLOOD, PRESSED BETWEEN TWO PLATES OF 

 GLASS, THE REAL DIAMETER OF THE PART SHOWN BEING THE 120TH OF AN INCH, 

 DAUUERREOTYPED BY MESSRS. DONNlJ AND FOUCAULT. 



MICROSCOPIC DRAWING & ENGRAVING. 



CHAPTER III. 



48. The beetle. 49. Its larva. 50. Drawing of it in its natural size. 

 51. Dr. Goring's magnified drawing. 52. Production of the beetle 

 from the egg. 53. The young larva. 54. Its voracity and manner 

 of seizing its prey. 55. Description of its organs. 56. Its chrysalis. 

 57. Water-beetle. 58. Gnat. 59. Dr. Goring's method of 

 drawing. 60. Drawing by the camera-lucida. 61. Section of the 

 human skin ; sweating-gland and duct. 62. The itch insect. 63. 

 Method of obtaining it. 



48. ANOTHEK of the tribe of insects, of whose larva Dr. Goring 

 has left a beautiful drawing, is the beetle, shown in fig. 32. 



49. The larva of this insect, like the former, is an inhabitant of 

 the water. It is remarkable for its ferocious and savage disposition, 



LARDNER'S MUSEUM OF SCIENCE. o , 81 . 



No. 71. 



