Fat vesicles in adipose (fatty) tissue. Adipose tissue is a subtype of connective tissue consisting of a growth of small sacs containing fat bound together by connective tissue and small blood vessels.
Miller, F. E.; Hunt, H. L.; McCormick, F.J.; Burr, B.; & King, M.L. Domestic Medical Practice: A Household Adviser in the Treatment of Diseases, Arranged for Family Use (Chicago: Domestic Medical Society, 1919) 2
Courtesy the private collection of Roy Winkelman