Today's free book is The Enchanted Lochan: Stories of Celtic Mythology by F. Carmichael Brunton (1917) with illustrations by Noel L. Nisbet. For the table of contents, check at the bottom of this post below the image.
The book is available at Hathi Trust (I have not checked for other online sources).
Table of Contents
I. ANGUS OG, THE EVER-YOUNG
II. LUGA, MASTER OF ALL ARTS
III. NUADA OF THE SILVER HAND
IV. BRIDGET OF THE FIRES
V. MIDIR THE PROUD
VI. GOIBNIU, THE MASTER-SMITH
VII. NIAM OF THE GOLDEN HAIR
VIII. DIANKET, THE PHYSICIAN
IX. MANANNAN OF THE SEA
X. TIR-NAN-OG