2 66 Sir Everard Home on the mode of generation 
inquiry of the person whose business it is to prepare them for 
being potted, what were the differences between the internal 
parts of the male and female ; he said, the only difference was, 
the one had no ova, the other had, in all other respects they 
were alike. He had never seen a lamprey in which there was 
no part corresponding to what I called ovarium. This remark 
from a person whose whole employment during the breed- 
ing season was to take out their viscera, corresponded so 
entirely with my own observations, that I began to enter- 
tain the opinion that the lamprey has not distinct sexes, but 
is an hermaphrodite animal. This doubt of their being male 
and female, w r as started in the beginning of the breeding 
season, and my friend Dr. Wilson Philip of Worcester, 
supplied me with lampreys at regular intervals, till the ova 
were shed, that I might prosecute this inquiry. I found 
upon examination, that the two glandular bodies projecting 
into the belly, one on each side of the ovarium, which have 
been always supposed to be the kidneys, varied very much in 
size and appearance at the beginning and end of the season. 
When the ova are so small that the animal is reputed to be a 
male, these glandular bodies and the black substance upon 
which they lie appear to form one mass, and the duct upon 
the anterior part is thin and almost transparent, containing a 
fluid equally so, but in the end of May, when the ova increase 
in size, these glandular bodies become larger, more turgid, 
and have a distinct line of separation between them and the 
black substance behind ; their structure is more developed, 
being evidently composed of tubuli running in a transverse 
direction, and the ducts leading from them are thicker in 
their coats and larger in size. 
