The two Tortoises have now been in my possession ten and nine years respectively. Six years ago I reported to this Society that _they measured_, the one 7½ and the other 7 inches in _length_. Now at the end of six further years their antero-posterior measurements are 9½ and 9 inches respectively—the measurements being made from before backwards over the convex surface of the carapace. They have, therefore, each of them, thus measured, increased exactly two inches in length in the last six years, or at the rate of exactly one-third of an inch per year. (The under flat surface of the shell now measures 6½ and 6¼ inches from before backwards. These Tortoises are said not usually to exceed 10 inches in entire length.) Then as to their _weight_. I have now kept an exact record of their respective weights in the spring and autumn of each of the past seven years, _i.e._ their weight on commencing to hybernate in October or November, and again their weight on returning afresh to light and more active existence in April or May of the following spring. And it is interesting to notice how almost continuously they have increased both in size and weight; and also how corresponding are the alterations, or otherwise, in the consecutive years, both of spring and autumn, of the two animals. In my former paper, I mentioned that during the summer months of 1886, when I first weighed them, _i.e._ from May to September, my Tortoises had gained in weight, the one 2½ ounces, and the other 1½ ounces; whilst each of them became lighter in the following winter by 2½ ounces. Since that time the spring and autumn weighings have been regularly continued, and the result is shown in the following table. WEIGHT OF LARGER TORTOISE. OF SMALLER TORTOISE. APRIL. OCTOBER. APRIL. OCTOBER. YEAR. lbs. ozs. lbs. ozs. lbs. ozs. lbs. ozs. 1886 2 7½ 2 10 2 3½ 2 5 1887 2 7½ 2 10 2 2½ 2 5 1888 2 10 2 13½ 2 5 2 8¼ 1889 2 13 2 14 2 8 2 8½ 1890 2 12½ 3 0½ 2 7½ 2 12 1891 2 15½ 3 2 2 10 2 12½ 1892 3 1 3 3½ 2 12 2 14½ In the seven years, therefore, 1886 to 1892, the larger Tortoise has increased in weight from 2 lbs. 10 ozs. to 3 lbs. 3½ ozs.; and the smaller Tortoise from 2 lbs. 5 ozs. to 2 lbs. 14½ ozs., giving a total increase of weight in this period of exactly 9 ounces for each animal, or an average annual increase of about 1 ounce and 5½ drachms (avoirdupois).