Left-handedness has, by instinct or from accurate observation, been regarded with disfavour in the proverbial sayings of many nations. It is decidedly common among criminals. Examining 81 normal persons, Marro found 70 right-handed, 7 left-handed, and 4 ambidextrous. Examining 190 working-men, he only found 6 left-handed. Altogether the proportion of normal left-handed and ambidextrous persons was 6.2 per cent. Among criminals, on the other hand, with the single exception of highwaymen, the proportion of left-handed and ambidextrous persons was in every case higher. Among 40 assassins in 17.5 per cent.; among 7 incendiaries in 28.5 per cent.; among 44 burglars in 18.1 percent. This corresponds with a greater sensory obtuseness, which has also been observed on the right side among criminals. It is also interesting to note the ambidextrous tendency among children, savages, and idiots. With the dynamometer, also, there appears to be a slightly greater prevalence of excess of the left hand over the right, judging from Marro’s experiences. It may be of interest to note here that among normal persons the proportion in which the left hand is stronger than the right is by no means small. Thus at the International Exhibition in London in 1884 observations made under Mr. Galton’s superintendence on 400 male adults--artisans, clerks, professional men, etc.--between the ages of twenty-three and twenty-six, showed that in 253 cases the right hand was stronger than the left in squeezing power; in 147 the left was stronger; in 28 both hands were equal. If we divide the individuals thus examined according to occupation the results vary curiously. Of 18 chemists, in 12 the right hand was stronger, in 5 the left, in 1 both were equal. Of 9 carpenters and joiners, in 4 the right hand was stronger, in 3 the left, in 2 both were equal. Of 87 clerks, in 52 the right hand was stronger, in 29 the left, in 6 both were equal. Of 9 medical men, in 5 the right hand was stronger, in 4 the left. Of 7 clergymen and ministers, in 3 the right hand was stronger, in 3 the left, in 1 both were equal. The high proportion of right-handed squeezers among the chemists is no doubt due to the effects of occupation, to the constant practice of gripping heavy bottles with the right hand. Occupation also, no doubt, among the carpenters and joiners, favours squeezing power in the left hand. The factor of occupation is less obvious among clerks, but would no doubt favour the right hand, and among these the proportion keeps very close to the average among the 400. The doctors are almost as left-handed in this respect as the carpenters, though the result can scarcely be influenced by occupation; while the clergymen, who are certainly most free from the influence of occupation in this respect, are the most left-handed of all, although here the figures are too small to allow of any very reliable results.