The size of alligator eggs, as might be expected, is subject to considerable variation. In measuring the eggs a pair of brass calipers was used, and the long and short diameters of more than four hundred eggs were obtained. A number of eggs of average size, when weighed in mass on the scales of a country store, gave an average of 2.8 oz. per egg. There was more variation in the long diameter of eggs than in the short diameter. The longest egg of all those measured was 85 mm.; the shortest was 65 mm. The widest egg (greatest short diameter) was 50 mm.; the narrowest egg (least short diameter) was 38 mm. The average long diameter was 73.742 mm.; the average short diameter was 42.588 mm. The greatest variation in long diameter in any one nest of eggs was 15.5 mm.; the greatest variation in short diameter in the eggs of any one nest was 11 mm. The average variation in the long diameter of the eggs from the same nest was 11.318 mm.; the average variation in the short diameter of the eggs from the same nest was 5.136 mm. It will be seen from the above that the average variation in the long diameter of eggs from the same nest is between one sixth and one seventh of the long diameter of the average egg; while the average variation in the short diameter of the eggs from the same nest is less than one eighth of the short diameter of the average egg. S. F. Clarke[5] gives the limits of the long diameter as 50 mm. and 90 mm., and the maximum and minimum short diameters as 45 mm. and 28 mm. No such extremes in size were noticed among the eight hundred or more eggs that were examined. [5] _Journal of Morphology_, vol. v. [Illustration: FIG. 9. AN ALLIGATOR’S NEST, SOMEWHAT SMALLER THAN THE ONE REPRESENTED IN FIG. 8, BUILT CHIEFLY OF FLAGS. The nest has been opened to show the irregularly arranged mass of eggs inside. The size and shape of the egg are shown by the one in the guide’s hand. (From a Photograph by the Author.)]